:root{--color-bg:#fff;--color-bg-soft:#f7f9fc;--color-bg-dark:#0b1020;--color-text:#111827;--color-text-muted:#6b7280;--color-border:#e5e7eb;--color-primary:#2563ff;--color-primary-dark:#1f4fd1;--shadow-card:0 16px 40px rgba(15,23,42,.08);--shadow-header:0 8px 24px rgba(15,23,42,.08);--radius-lg:24px;--radius-md:16px;--radius-sm:12px;--container-max-width:1800px;--container-inline-gap:128px;--section-spacing:64px;--section-heading-max-width:640px;--section-heading-size:clamp(22px,2.4vw,32px);--section-body-size:14px;--section-body-line-height:1.65;--button-padding-y:10px;--button-padding-x:16px;--button-font-size:13px;--nav-link-size:13px;--chip-font-size:12px;--chip-padding-y:6px;--chip-padding-x:10px;--surface-padding-sm:20px;--surface-padding:24px;--surface-padding-lg:32px;--card-title-size:17px;--card-title-lg-size:20px;--feature-title-size:22px;--feature-title-lg-size:clamp(28px,3vw,38px);--card-body-size:13px;--card-body-line-height:1.65;--detail-title-size:clamp(28px,3.2vw,42px);--detail-summary-size:15px;--hero-title-max-width:500px;--hero-description-max-width:500px;--hero-title-size:clamp(30px,3.8vw,46px);--hero-description-size:14px;--motion-ease-emphasis:cubic-bezier(.22,1,.36,1);--motion-ease-smooth:cubic-bezier(.16,1,.3,1)}*{box-sizing:border-box}html{font-family:Inter,PingFang SC,Microsoft YaHei,sans-serif;scroll-behavior:smooth}body,html{background:var(--color-bg);color:var(--color-text)}body{margin:0;overflow-x:hidden}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}.site-shell{background:radial-gradient(circle at top right,rgba(37,99,255,.08),transparent 28%),linear-gradient(180deg,#fff,#f7f9fc);display:flex;flex-direction:column;min-height:100vh}.site-main{flex:1}.container{margin:0 auto;width:min(var(--container-max-width),calc(100% - 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